Maintain accurate blood pressure readings with lower lifetime cost with gear-free DuraShock technology, the first major innovation in aneroid technology in nearly 100 years. The Welch Allyn DS66 Trigger features an innovative trigger-release design for easy operation. Shock resistant to maintain accuracy with lower lifetime cost can withstand up to 3" drop and remain in calibration. Soft comfort grip. Jewel movement for long life. Laser-engraved dial face for accuracy. Trigger deflation valve for smooth, one-finger operation. Lighter weight than traditional models won't weigh down your lab coat. Premium aesthetics. Latex-free. 15-year calibration warranty.